I'm 5/9 on a Large 95 running a 380mm/125mm Reverb with probably 1cm of space from the frame tube to the top collar (but again, I'm 5/9 on a Large).
I route my cable through the provided top-tube tabs and use the ProMax DP-1 seat clamp to help guide the cable (highly recommended - this really cleaned up the routing and helped keep the cable away from my tire under compression). Lastly, I have the RH side push button mount, but run it upside down on the left side (which makes me wonder why they don't do this to begin with).